// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DISPATCHER_H_
#define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DISPATCHER_H_

#include <map>

#include "base/macros.h"
#include "base/synchronization/lock.h"
#include "content/child/worker_thread_message_filter.h"

namespace content {

class NotificationDispatcher : public WorkerThreadMessageFilter {
public:
    explicit NotificationDispatcher(ThreadSafeSender* thread_safe_sender);

    // Generates a, process-unique new notification Id mapped to |thread_id|, and
    // return the notification Id. This method can be called on any thread.
    int GenerateNotificationId(int thread_id);

protected:
    ~NotificationDispatcher() override;

private:
    // WorkerThreadMessageFilter:
    bool ShouldHandleMessage(const IPC::Message& msg) const override;
    void OnFilteredMessageReceived(const IPC::Message& msg) override;
    bool GetWorkerThreadIdForMessage(const IPC::Message& msg,
        int* ipc_thread_id) override;

    using NotificationIdToThreadId = std::map<int, int>;

    base::Lock notification_id_map_lock_;
    NotificationIdToThreadId notification_id_map_;
    int next_notification_id_ = 0;

    DISALLOW_COPY_AND_ASSIGN(NotificationDispatcher);
};

} // namespace content

#endif // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DISPATCHER_H_
